The survival instinct tends to prolong life. The fundamental drive tends to inform itself about the universe.
Advice to Clever Children (1981)
“Existentialism is nothing else but an attempt to draw the full conclusions from a consistently atheistic position. Its intention is not in the least that of plunging men into despair. And if by despair one means as the Christians do – any attitude of unbelief, the despair of the existentialists is something different. Existentialism is not atheist in the sense that it would exhaust itself in demonstrations of the non-existence of God. It declares, rather, that even if God existed that would make no difference from its point of view. Not that we believe God does exist, but we think that the real problem is not that of His existence; what man needs is to find himself again and to understand that nothing can save him from himself, not even a valid proof of the existence of God. In this sense existentialism is optimistic. It is a doctrine of action, and it is only by self-deception, by confining their own despair with ours that Christians can describe us as without hope.”
Existentialism Is a Humanism, lecture (1946)
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Jean Paul Sartre 321
French existentialist philosopher, playwright, novelist, sc… 1905–1980Related quotes

What is an Agnostic? (1953)
1950s

Source: 1840s, The Sickness unto Death (July 30, 1849), p. 49

God's Mechanics: How Scientists and Engineers Make Sense of Religion, 7, 9780787994662, Consolmagno, Guy, 2008 https://books.google.com/books?id=s276jyAQ5hcC&pg=PA7,

You Can Lead an Atheist to Evidence, But You Can't Make Him Think (2009)
Source: You Can Lead an Atheist to Evidence, But You Can't Make Him Think: Answers to Questions from Angry Skeptics

God, Atheism and Evidence, as Theoretical Bullshit, hosted on YouTube. (11 January 2010) http://www.youtube.com/watch?v=9stJ8h2ilZU

Source: Wishful Thinking: A Theological ABC
This is from a summary of Johnsons ideas on the "Wedge strategy" which appeared in "Missionary Man" by Rob Boston in Church and State Magazine (April 1999) http://web.archive.org/web/20010508032051/http://www.au.org/churchstate/cs4995.htm, and not a direct quote. See also "Bad Philip Johnson Quote" at Panda's Thumb http://pandasthumb.org/archives/2006/02/post-4.html
Misattributed